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Propriétés physico-chimiques et comportement différé des matériaux cimentaires sous irradiations gamma

Abstract : The project of Centre Industriel de stockage Géologique or CIGEO supported by Andra (French Agency for Radioactive Waste Management) will allow storing intermediate level and high-level wastes 500 meters deep inconcrete galleries built in an impermeable argillaceous rock. The main objective of this study is to understand the effects of lower dose rate external gamma irradiations on the physical-chemical and hydro-thermo-mechanical behavior of concrete which could be used in the CIGEO structures and elements. A multiscale and multi-physics experimental protocol has been established during this PhD work. Mortar and cement paste specimens have been irradiated in a gamma irradiator (E = 0.667 MeV,LET = 0.23 keV.μm-1) and subsequently subjected to bending and compressive mechanical stress tests. These irradiations have been performed at the ARRONAX cyclotron facility (Saint-Herblain, France). The variations of compressive and bending strength after irradiation have been measured for different materials (humid, dried and carbonated mortar and cement pastes) showing a high decrease of mechanicals properties. Mechanical variations have been explained by the study of physical-chemical evolution of calcium silicate hydrates (C-S-H), the major phase composing the concrete which can be modified under gamma radiation. Microscopic and macroscopic results were successfully compared to explain the evolution of the cementitious materials under low doserate of gamma radiation.
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Submitted on : Friday, April 26, 2019 - 11:55:07 AM
Last modification on : Wednesday, June 24, 2020 - 4:19:52 PM


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  • HAL Id : tel-02111875, version 1


Maxime Robira. Propriétés physico-chimiques et comportement différé des matériaux cimentaires sous irradiations gamma. Matériaux. Ecole nationale supérieure Mines-Télécom Atlantique, 2018. Français. ⟨NNT : 2018IMTA0115⟩. ⟨tel-02111875⟩



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